Pl slv q22

Pl slv q22 22.Using step deviation method , calculate the arithmetic mean of the following grouped distribution Class 10-30 30-50 3 50-70 8 70-90 11 90-110 110-130 130-150 Frequency 4 6 2 6 SECTION D uestion number 23 to 30 carry 4 marks each)

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